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I would expect gummed up injectors before fouled plugs. You did use some stabilizer, right? If not, drain the tank, put a whole lot of injector cleaner and fresh fuel in the tank and give it a try. It may take a while for the injector cleaner to eat its way through the varnish and crud. If it floods, you will smell gasoline. If flooding happens, I would suspect the plugs. Another thing to try is to pull a plug and look at it. If it looks OK, it is OK.
If you have concerns about whether it is sparking, reattach it to the plug wire and cap and set it somewhere in contact with metal part of the bike. Make sure it is away from anything you don't want scorched and keep your fingers, toes, etc. away from it. What you are trying to do is get it to spark outside the motor, and since the plug wire is only one half the circuit, the threaded part has to ground to some part of the bike. You do it just to make sure the plug is getting juice and firing. If it does, then it is a fueling problem. It has been a very long time since I did a test like that, and it was on a thoroughly non-digital MG, not a fuel injected motorcycle, so keep my shade tree background in mind if you decide to do the test.
One other thing to test- I just thought of it. The fuel pump lives inside the fuel tank and could get very gummed up if the fuel goes bad.
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